Here is the full list of all 40 Atom Zombie Smasher achievements.
Accrue 500 gold medals.
Rescue 10,000 scientists.
Rescue 100,000 people.
Launch 500 Llama Bombs.
Accrue 10,000 landmine kills.
Accrue 10,000 dynamite kills.
Accrue 10,000 sniper kills.
Accrue 10,000 infantry kills.
Get 100 landmine kills in a mission.
Get 100 dynamite kills in a mission.
Destroy 50 Zed in one landmine explosion.
Destroy 50 Zed in one dynamite explosion.
Destroy 50 Zed in one artillery strike.
Complete a campaign with the Hardcore and Permadeath modifier.
Use snipers to destroy 100 Zed in a mission.
Accrue 10,000 artillery kills.
Rescue 40 or more people in one helicopter pickup.
Destroy a Mega Zed.
Defeat Wave 7 in the KringleJammer mini-game.
Complete a campaign with the Alt. Spawning modifier.
Complete a mission with 3 players.
Rescue 300 people in a mission.
Complete a campaign with the Triplets modifier.
Complete a level-3 outbreak mission.
Cleanse four Zed territories with one Llama Bomb.
Purchase a Llama Bomb.
Unlock all the vignettes.
Complete a mission under 30 seconds.
Complete a 20,000 point campaign.
Get 100 artillery kills in a mission.
Get 100 infantry kills in a mission.
Rescue 200 people in a mission.
Complete a level-4 outbreak mission.
Survive the night.
Complete the campaign.
Have a merc reach Level 5 veterancy.
Rescue at least 100 people in July.
Rescue everyone in a mission.
Rescue 100 people in a mission.
Destroy all Zed in a mission.